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This CL converts ios_web_shell_egtests.MetaTagTestCase to
ios_web_inttests.MetaTagTest, because it doesn't require UI for testing.

Bug: 930859
Change-Id: Idad9e27707ded89a180d9e47e127a8e3cf5260d1
Reviewed-on: https://chromium-review.googlesource.com/c/1488917
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636752}